ASTM A709 steel plate is suitable for carbon steel and high-strength low-alloy structural steel, steel plate and steel bar, and quenched and tempered alloy steel structural steel plate for bridges. There are mainly nine steel grades, including A709 grade 36, A709Grade50, A709Grade 50S, A709Grade 50W, A709Grade HPS50W, A709GrHPS 70W, A709Grade 100, A709Grsde 100W, A709Grade HPS 100W.
Among them, A709-50W, A709-HPS 50W, A709-HPS 70W, A709-100, A709-100W, A709-HPS 100W grades have improved resistance to atmospheric corrosion.
A709Grade36, A709Grade50 steel grades should be semi-killed steel or killed steel.
A709Grade 50W, A709Grade HPS 50W, A709Grade HPS 70W rigid grades are produced by fine grain technology.
A709Grade HPS 50W, A709Grade HPS 70W, A709Grade HPS 100W steel grades are produced by low hydrogen process, such as vacuum treatment in the steel manufacturing process, controlled heating of ingots and slabs, controlled slow cooling of ingots, slabs or steel plates.
A709Grade 100, A709Grade 100W, A709Grade HPS 100W steel grades shall meet fine austenite grain size requirements.
A709Grade HPS 50W, A709Grade HPS 70W should be supplied in one of the following states: hot rolling, controlled rolling, TMCP, quenching and tempering.
